Le Sat, 18 Oct 2008 19:32:16 +0900, J.H.Kim <frog1120@xxxxxxxxx> a écrit : > I'm reading kernel source code for the first time. First, I'd > like to know how the PCI driver works. > I found the routines which scans PCI bus and and add data structure > of the found devices into bus data structure as linked list. > But I got lost there. Each device probe routine seems to be called > after the related module is loaded. > I cannot find the routines which call modprobe or insmod for desired > modules related to found devices and I wonder how the module for each > device is selected. > So, I'm finding where the PCI network driver module is loaded, for > example. Any advice would be greatly appreciated. In /lib/modules/<kernelversion>/modules.alias, there is a list of associations between PCI IDs and modules names, like: alias pci:v0000106Bd00001645sv*sd*bc*sc*i* tg3 When a PCI device is detected on the PCI bus, the kernel sends an uevent to the user-space daemon udev, with a MODALIAS variable, containing a string like pci:v0000106Bd00001645sv*sd*bc*sc*i*. Then udev runs the modprobe command with the module alias in argument. modprobe travels through the modules.alias file and loads the corresponding module. Once loaded the module tells the kernel that it handles PCI devices identified by some IDs, and its ->probe() method gets called. Sincerly, Thomas -- Thomas Petazzoni, Free Electrons Kernel, drivers and embedded Linux development, consulting, training and support. http://free-electrons.com -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
